Piston



June 29 1926.

- 1,590,281 C L. BUETTNER El AL PISTON Filed March s, 1926 yg MVENTORgJ I latented dune a y "UNITED/STATES "PATENT oFs cE.

CHARLES 1.. nnnr'rnnnmn HENRY c. MERGEL, or mnwavknn, wrscoirsni'.

PISTON. Application and March a, 1m.. stamina".

This invention relates'to improvements in However, the piston casing is provided with pistons, particularly adapted for use in in-. a pair of opposed side openings 5 of a-sub ternal combustion engines. j stantial size, the sides of which taper down 55 Experience has shown that in internal 'wa'rdly slightly. Said openings 5 are closed I combustion engines, after a certain amount by means of shoes-6 which are tightly fitted of use, the bore of the cylinders will become and conform exactly wifli the shape of the enlarged due to the wear occasioned bythe openings and with the oitsidecurvature'of I action of the pistons therein with the result t e iston casing. .60 that the pistons will not fit perfectly within T e'interior of the pistoncasingadficent the cylinders Consequent y, the en ine will each side edge of each opening 5 is formed I lose efliciency' and the pis one will ave too with ribs or flanges 7 parallel with the'cen-' much play. Tb correct this, the present tral axis of the piston. The inner faces of practice is to relbore the cylinders or change the shoes Bare formed with complementaryth istm s, vert1cal flanges 8 adapted for engagement It is, therefore, the primary object of-the with the faces of the flanges 7 and theshoea present invention to overcome the above obdare held tightly withinthe openings'fianda jections by providing an adjustable piston apinst the flanges 7 byme'ans of transverse whose width may he adjusted from time to bolts 9'extending thrdugh the flanges .7 and :79 n

"time to compensate for the wear of the cyl-, Into the flanged portions 8.

inder bore, thereby insuring a perfectly fiq- The piston is provided qwith th'e ting piston. bushings 1 0 for the pistonrod 1A further. object of the invention is to external'oil groove's lh v provide a piston fitted with laterally ad- 1 Normally, when the cylinder bore is an-1" ustable shoes whereby the outside circumworn, the shoes 6 are bolted n tightly so ference of the piston may be varied. that their outer faces will be flush :with the i A further object of the invention is ,to outercontour of the piston casing. ;.Fmm

. rovide an adjustable iston arranged so time to t1me,.h0wever, asthe cylinder bore that adjustments thereofmay'be easily and becomes enlarged from wear, the shoes 6 can 80 and also with. 1.7

ibkl d "be readilyforced outwardly any desired dis- A further object of the invention is to tame to increase the circumferen ofthe provide an adjustable piston which is. of plston. This is accomplished by loosening very simple construction, with which any the bolts 9 and inserting shims or the ma.--

' [form of internal combustion engine may he ten-a1 of adesired thickness between the p easily fitted, is inexpensive to manufacture, adjacent faces of the flanges 7 and 8.

is strong and durable, and is well'adapted Although the improved-piston has been I fo th ur oses described, p llustrated with a pair of opposed shoes, With the above and other objects'in view 1t should be understood that onl one, ,or the invention consists of the improved adany number-of shoes maybe use without justable piston, and its parts and combinadeparting from the spirit of the invention. a

tions' as set -forth in the claims and all From-the foregoing description it will be qui alents thereof. Seen that the improved adjustable piston is In the, accompanying drawing in which of very simple and novel construction, and tithe same reference characters indicate the is well adapted for the purposeset forth. 'sanie partsjinboth of the views; VVha-t is claimed as the invention is: 11- l igg'l isa side'view of the ad'ustable I A piston, comprisin a cylindrical casing I, piston, part being broken away an shown having anopening 0 a substanial size im 'i insect-ion; and the side thereof, longitudinal ribs. formed Fig. 2 is a bottom viewthereof; in the interior of the casing adjacent the -'.Referring now .rnore particularly to the sides of the opening, a curved plate closing drawing it will appear that the piston is said opening, the exterior shape thereof concylindrlcal in shape and exteriorly resemforming with the exterior shape of them 7' bles the ordinary piston in appearance. ing, there being longitudinal ribs forms 1 along the inner side edges of the plate for the casing and extending into the casing engagement with said casing ribs, said plate ribs and plate ribs to hold the plate in adbemg movable laterally with respect to the justed position.

casing to'nermit the rlispositionof sheets of In testimony whereof, we'aflix our sig- 5 material tween the adjacent ribs to hold natures.

the plate outwardly with respect to the ex- CHARLES L. BUETTNER.

tarior 0f the casing, and bolts entirely within HENRY G. MERGEL. 

